58 lines
2.2 KiB
C
58 lines
2.2 KiB
C
#ifndef SQUIGGLEC
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#define SQUIGGLEC
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// uint32_t header
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#include <stdint.h>
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// Macros
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#define EXIT_ON_ERROR 0
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#define MAX_ERROR_LENGTH 500
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#define PROCESS_ERROR(...) \
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do { \
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if (EXIT_ON_ERROR) { \
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printf("@, in %s (%d)", __FILE__, __LINE__); \
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exit(1); \
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} else { \
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char error_msg[MAX_ERROR_LENGTH]; \
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snprintf(error_msg, MAX_ERROR_LENGTH, "@, in %s (%d)", __FILE__, __LINE__); \
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struct box error = { .empty = 1, .error_msg = error_msg }; \
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return error; \
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} \
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} while (0)
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// Pseudo Random number generator
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uint32_t xorshift32(uint32_t* seed);
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// Distribution & sampling functions
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float rand_0_to_1(uint32_t* seed);
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float rand_float(float max, uint32_t* seed);
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float unit_normal(uint32_t* seed);
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float random_uniform(float from, float to, uint32_t* seed);
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float random_normal(float mean, float sigma, uint32_t* seed);
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float random_lognormal(float logmean, float logsigma, uint32_t* seed);
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float random_to(float low, float high, uint32_t* seed);
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// Array helpers
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float array_sum(float* array, int length);
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void array_cumsum(float* array_to_sum, float* array_cumsummed, int length);
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// Mixture function
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float mixture(float (*samplers[])(uint32_t*), float* weights, int n_dists, uint32_t* seed);
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// Box
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struct box {
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int empty;
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float content;
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char* error_msg;
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};
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// Inverse cdf
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struct box inverse_cdf_float(float cdf(float), float p);
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struct box inverse_cdf_box(struct box cdf_box(float), float p);
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// Samplers from cdf
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struct box sampler_box_cdf(struct box cdf(float), uint32_t* seed);
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struct box sampler_float_cdf(float cdf(float), uint32_t* seed);
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#endif
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